add cache command

Sources/XcodeGenCLI/Commands/CacheCommand.swift

@@ -0,0 +1,44 @@
+import Foundation
+import PathKit
+import ProjectSpec
+import SwiftCLI
+import XcodeGenKit
+import XcodeProj
+import Version
+
+class CacheCommand: ProjectCommand {
+
+    @Key("--cache-path", description: "Where the cache file will be loaded from and save to. Defaults to ~/.xcodegen/cache/{SPEC_PATH_HASH}")
+    var cacheFilePath: Path?
+
+    init(version: Version) {
+        super.init(version: version,
+                   name: "cache",
+                   shortDescription: "Write the project cache")
+    }
+
+    override func execute(specLoader: SpecLoader, projectSpecPath: Path, project: Project) throws {
+
+        let cacheFilePath = self.cacheFilePath ?? Path("~/.xcodegen/cache/\(projectSpecPath.absolute().string.md5)").absolute()
+
+        var cacheFile: CacheFile?
+
+        // generate cache
+        do {
+            cacheFile = try specLoader.generateCacheFile()
+        } catch {
+            throw GenerationError.projectSpecParsingError(error)
+        }
+
+        // write cache
+        if let cacheFile = cacheFile {
+            do {
+                try cacheFilePath.parent().mkpath()
+                try cacheFilePath.write(cacheFile.string)
+                success("Wrote cache to \(cacheFilePath)")
+            } catch {
+                info("Failed to write cache: \(error.localizedDescription)")
+            }
+        }
+    }
+}

Sources/XcodeGenCLI/Commands/DumpCommand.swift

@@ -49,7 +49,7 @@ class DumpCommand: ProjectCommand {
             try file.parent().mkpath()
             try file.write(output)
         } else {
-            stdout.print(output)
+            success(output)
         }
     }
 }

Sources/XcodeGenCLI/Commands/GenerateCommand.swift

@@ -8,9 +8,6 @@ import Version
 
 class GenerateCommand: ProjectCommand {
 
-    @Flag("-q", "--quiet", description: "Suppress all informational and success output")
-    var quiet: Bool
-
     @Flag("-c", "--use-cache", description: "Use a cache for the xcodegen spec. This will prevent unnecessarily generating the project if nothing has changed")
     var useCache: Bool
 
@@ -46,7 +43,7 @@ class GenerateCommand: ProjectCommand {
             Path("~/.xcodegen/cache/\(projectSpecPath.absolute().string.md5)").absolute()
         var cacheFile: CacheFile?
 
-        // read cache
+        // generate cache
         if useCache || self.cacheFilePath != nil {
             do {
                 cacheFile = try specLoader.generateCacheFile()
@@ -138,22 +135,4 @@ class GenerateCommand: ProjectCommand {
             try Task.run(bash: command, directory: projectDirectory.absolute().string)
         }
     }
-
-    func info(_ string: String) {
-        if !quiet {
-            stdout.print(string)
-        }
-    }
-
-    func warning(_ string: String) {
-        if !quiet {
-            stdout.print(string.yellow)
-        }
-    }
-
-    func success(_ string: String) {
-        if !quiet {
-            stdout.print(string.green)
-        }
-    }
 }

Sources/XcodeGenCLI/Commands/ProjectCommand.swift

@@ -12,6 +12,9 @@ class ProjectCommand: Command {
     let name: String
     let shortDescription: String
 
+    @Flag("-q", "--quiet", description: "Suppress all informational and success output")
+    var quiet: Bool
+
     @Key("-s", "--spec", description: "The path to the project spec file. Defaults to project.yml. (It is also possible to link to multiple spec files by comma separating them. Note that all other flags will be the same.)")
     var spec: String?
 
@@ -58,4 +61,22 @@ class ProjectCommand: Command {
     }
 
     func execute(specLoader: SpecLoader, projectSpecPath: Path, project: Project) throws {}
+
+    func info(_ string: String) {
+        if !quiet {
+            stdout.print(string)
+        }
+    }
+
+    func warning(_ string: String) {
+        if !quiet {
+            stdout.print(string.yellow)
+        }
+    }
+
+    func success(_ string: String) {
+        if !quiet {
+            stdout.print(string.green)
+        }
+    }
 }

Sources/XcodeGenCLI/XcodeGenCLI.swift

@@ -15,6 +15,7 @@ public class XcodeGenCLI {
             description: "Generates Xcode projects",
             commands: [
                 generateCommand,
+                CacheCommand(version: version),
                 DumpCommand(version: version),
             ]
         )